body{margin: 0px;}
ul{margin: 0px;padding: 0px;}
.menu{background-color: black;height: 100px;width: 100%;border:2px solid black;}
.menu li{width: 20%;height:100px;box-sizing:border-box;border:2px solid red;float: left;list-style-type: none;background-color: white;}